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USA TODAY

In less than a week, two more disturbed young men with guns have wreaked havoc at two more very public locations.

On Friday, a lone gunman seeking to "instill fear" in the "traitorous minds" of Transportation Security Administration officers shot and killed one of them at a Los Angeles International Airport checkpoint. The gunman wounded two other officers and a teacher before he was shot by airport police. It could have been a lot worse.

On Monday, a gunman in a black motorcycle helmet walked into the largest shopping mall in New Jersey and opened fire. Terrified shoppers scattered. The ...